CPC F25B 49/022 (2013.01) [F25B 1/10 (2013.01); F25B 41/22 (2021.01); F25B 41/31 (2021.01); F25B 43/006 (2013.01); F25B 2600/0253 (2013.01); F25B 2700/193 (2013.01)] | 17 Claims |
1. A heat source unit comprising:
a heat source circuit connected to an air-conditioning unit and a refrigeration-facility unit to constitute a refrigerant circuit for performing a refrigeration cycle in which a high pressure is equal to or greater than a critical pressure; and
a control unit,
the heat source circuit including: a first compressor configured to suck a refrigerant from the air-conditioning unit; a second compressor configured to suck the refrigerant from the refrigeration-facility unit; an intermediate flow path into which the refrigerant compressed in the first and second compressors is discharged; a third compressor configured to suck the refrigerant from the intermediate flow path; a radiator; a liquid side flow path connected to a liquid end of the radiator; a gas-liquid separator provided in the liquid side flow path; a venting pipe through which gas in the gas-liquid separator is sent to the intermediate flow path; and a first valve configured to open and close the venting pipe, wherein
if a first condition that an intermediate pressure corresponding to a pressure of the intermediate flow path is greater than a predetermined value is satisfied in an operation in which the first, second, and third compressors are operated, the control unit executes a first action of increasing the number of revolutions of the third compressor.
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